[PATCH v7 0/5] PM / devfreq: Add dynamic scaling for imx8m ddr controller
leonard.crestez at nxp.com
Mon Jan 13 15:36:14 PST 2020
On 10.01.2020 20:34, Adam Ford wrote:
> On Wed, Dec 18, 2019 at 10:42 AM Adam Ford <aford173 at gmail.com
> <mailto:aford173 at gmail.com>> wrote:
> > > U-Boot booted and Linux booted, but I still get:
> > >
> > > imx8m-ddrc-devfreq 3d400000.memory-controller: failed to init
> > > firmware freq info: -19
> > Which version of u-boot is that, upstream? I'm subscribed to uboot
> > mailing list and I see that imx8m support has its own separate issues
> > but my familiarity is limited :(
> U-Boot 2020.01-rc4-00244-gf39abbbc53-dirty (Dec 18 2019 - 09:27:40
> > I've only ever tested with NXP uboot and the NXP version of mkimage:
> > https://source.codeaurora.org/external/imx/imx-mkimage/
> I will try your versions and see what happens.
> > My bootloader prints the following BuildInfo:
> > - ATF 70fa7bc
> > - U-Boot 2019.04-00019-g4d377539a119
> Thanks for your help.
> I wanted to try again after everything was merged into linux-next.
> I am using the U-Boot master (as of 10 Jan 2020), with ATF from
> 4.19.35_1.1.0 from Code Aurora. I have tried your ATF, but I don't see
> any change in behavior. I have made the DDRC a module, but I still get
> the same error message.
> [ 2.204554] imx8m-ddrc-devfreq 3d400000.memory-controller: failed to
> init firmware freq info: -19
> Is there something else I can try?
Yes, the NXP branch of uboot from Code Aurora (my commit hash is above).
I understand you want to use uboot and atf master, apparently they both
need to be patched for this feature to work. It would still be
interesting to validate.
More information about the linux-arm-kernel